摘要
该文主要分析了在自适应调制系统中,帧长自适应和信道预测对系统性能的影响。推导了信道预测和没有倌道预测的自适应调制系统的频谱效率公式,分析结果表明对于自适应调制系统,信道预测的系统频谱效率是最优的,非信道预测系统根据信道情况选择最优帧长可以获得该系统的最优系统频谱效率,但它是低于信道预测的频谱效率的,而且是随多普勒频率的增大而逐渐减小的。
In this paper, the effect of packet duration and channel prediction is analyzed in adaptive modulation. Spectral efficiency equations are derived for both systems with and without channel prediction. Numerical results show that systems with channel prediction can get maximum spectral efficiency while systems without channel prediction but chosen optimum packet length can get suboptimum frequency efficiency, which is inversely proportional to Doppler frequency.
出处
《电子与信息学报》
EI
CSCD
北大核心
2004年第5期766-770,共5页
Journal of Electronics & Information Technology
基金
韩国电信研究院(ETRI)资助课题
关键词
信道预测
自适应调制
帧长
频谱效率
无线通信
Adaptive modulation
Packet duration adaptation
Channel prediction Spectral efficiency